Always glad to help another retiree out who has a budget. I do not post because everyone feels they have it "right" and proud of what they have, everyone feels they have made the right choices and make recommendations that are well-intentioned based on their experiences, etc. When you see fairly popular reviewers on youtube getting nasty with their peers, one wonders if it's worthwhile offering their views but I'm sure somewhere in there, there's a profit motive. So............................ here are a couple of more things to consider:
1. Everyone's has an opinion of how their amp sounds - warm, clean, etc. However, what is the function of a preamp and/or power amp? Perhaps you'll agree with me that the answer is to accurate reproduce the source? Assuming your source is an accurate reproduction of original live material for example, shouldn't the best amp and pre-amp's functions be to provide "uncoloured" gain or attenuation.
In the chain of devices, there's already too much potential for coloration (so-called mastered source material, component/renderer, DAC, pre-amp, power amp, and most important speakers) that makes one wonder which piece of equipment is actually the cause for that pleasing or awful music you're hearing.
My belief is that if what I am hearing should sound like the live performance of the performer(s), If that, then the combination of equipment I am using is optimal. Yet how many of us have the luxury of that experience to make those comparisons.
Without that luxury, one has to hope that the "source" is accurate (after going through all the digitization/adjustments/etc.) and the components that follow do what they are supposed to do.
2. My recommendation: I've always purchased what I am fairly certain will not result in an astronomical loss should I become disappointed and have to sell it off. Given your budget, great deals in the used market may cushion some of that when you want to unload it as you may not have to bear the brunt of new equipment depreciation. Alternatively, the shop or mfg you are dealing with has a good return policy.
Perhaps more thoughts later. This is my 2nd post now :).